-134 OSBORX AND REEDS PREHISTORY OP MAX IN EUROPE 



may be termed Oromerian. In the heart of the Bed Crag there has also 

 been discovered by Moir another human industry, which may be termed 

 Foxhallian. In the sub-Bed Crag detritus there have also been found 

 flints of human manufacture. The relation of these extremely ancient 

 industries to the geologic table is exhibited in the final correlation table 

 of this article, figure 13. 



Deperet' s Interpretation and Correlation of the British Quaternary 



Reviewing the researches of British geologists. Deperet interprets the 

 British Quaternary succession as follows : 



[=1 GlaciatioNj Seaman, and First InterglaciaJ Stage, Xorfolkian 



of Geikie] 



Sicilian-Cromerian Stage (in part). — First phase. The Quaternary 



begins on the Norfolk coast between the early Pleistocene Weybourn and 

 Chillesford Crags and the Forest Bed of Cromer. Between two fresh- 

 water beds is the fluvio-marine or estuarine Forest Bed proper, composed 

 of trunks and routs of trees that drifted into an estuary — the fluvio- 

 marine shells of the Forest Bed are of modern Xorth Sea littoral species — 

 Cardium edule. Mytilus edulis, Donax vittatus, Tellina balthica, Mya 

 truneata, Purpura lapiUus, Littorina littorea. Xot far distant occurs 

 one arctic species. Scalaria grwnlandica, which indicates the approach 

 of polar currents in spite of the generally temperate fauna. The Forest 

 Bed was then at sealevel. indicating that an important phase of marine 

 recession and continental elevation occurred toward the beginning of 

 Sicilian time. 



Second phase. There followed a continental depression and marine 

 invasion, probably to the 90-100 meter line, with the appearance of many 

 arctic shells, Yoldia myalls and Astarta borealis, intermingled with a 

 majority of surviving Forest Bed species. The Yoldia of this species 

 may occur at a depth of 300 meters. Deperet concludes that although 

 it is difficult to determine the exact altitude of the shoreline at this 

 point, there is nothing to oppose the idea that it had attained the normal 

 altitude of the Sicilian — say. to 100 meters. 



Both the Yoldia myall? bed and the underlying Forest Bed may be 

 compared with the Sicilian Stage in the Mediterranean, also character- 

 ized by species imported by cold Atlantic currents. In brief, Deperet 



[•relates the coldest marine fauna of the British coast with the 100- 

 meter level and the cold Mediterranean fauna of the Sicilian Stacre. To 

 the same stage may be attributed the angular blocks of clay and the 



